Mr. White acute delirium with dementia case study guide

The case framing does half the diagnostic work for you and then asks you to finish it: the week's content is psychiatric disorders in older adults, the stated theme is that a secondary diagnosis is often masked by the psychiatric picture, and the vignette already concludes that Mr. White's presentation is most consistent with acute delirium. So the first question — the most likely diagnosis to frequently cause delirium in patients with dementia — is not asking you to re-diagnose the delirium; it is asking what is underneath it. Read the vignette's plants: four days of increased confusion with new urinary incontinence, a mildly enlarged prostate on exam, and an MMSE fallen from 18 to 12. In an elderly man with that cluster, a urinary tract infection is the classic masked precipitant the literature names most often, with medication effects — especially anticholinergic burden and sedative-hypnotics — as the competing answer worth acknowledging in a sentence.

The testing question rewards a workup argued from precipitants rather than a shotgun list. Start with what the leading answer demands: urinalysis and urine culture for the suspected infection. Then cover the reversible-cause panel that delirium guidelines march through — serum electrolytes for hyponatremia and hypercalcemia, glucose, renal function for uremia, a medication reconciliation performed as deliberately as any lab, and pulse oximetry given the COPD history, since hypoxia and hypercapnia are precipitants his chart makes plausible. Each test should carry a one-line rationale naming the cause it detects or excludes; that structure demonstrates you understand testing as hypothesis-driven. Neuroimaging is the discipline check — reserved for focal findings, head trauma, or a workup that comes back clean, and saying so explicitly earns more credit than ordering it reflexively.

Treatment options divide into the cause, the syndrome, and the safety around it, and strong answers keep the three layers visible. Treat the precipitant first: antibiotics if the urinalysis confirms infection, discontinuation or substitution of offending medications if reconciliation finds them. Manage the delirium itself nonpharmacologically as first line — reorientation, sleep-wake restoration, sensory aids, early mobility, family presence — because antipsychotics in dementia carry a boxed mortality warning and are reserved for severe agitation threatening safety, at low dose and short duration, a caveat worth stating in exactly those terms. Then protect the baseline: his dementia means recovery will be slower and incomplete recognition is common, so plan reassessment against his MMSE baseline of 18 rather than against a normal score. Answer all three questions with the vignette's own data doing the arguing.